"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

The childhood home of a Hollywood legend.

A jukebox headstone marks the grave of the Cleveland disc jockey credited with coining the term “rock 'n' roll."

This grave marks the final resting place of pioneer John Chapman, better known as Johnny Appleseed.

The colonial city's social history is reflected in its fanciful door knockers.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

The Andean town where every single building is decorated with a brightly colored frieze.

Ripped apart by a bomb in 1993, the shell of Pablo Escobar's infamous vacation house still stands.

A 10 million-ton rock once worshiped by the Tahamies Indians, accessed by an astounding staircase.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

The only presidential monument to display a late POTUS's actual casket.

A bronze statue on a downtown corner honors Minneapolis's favorite career gal.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

One of two giant blue cockerel statues erected with an intentional double meaning.

This kaleidoscopic mural shows Bob Dylan throughout his transition from young troubadour to Nobel laureate.

Seemingly unremarkable items like empty sushi trays, chef hats, and freshness stickers are being preserved so future generations can look back on this beloved cultural import.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Back in 1952, you could get a mushroom cloud chaser with your atomic cocktail.