A World War II evacuation tunnel turned into a history display of Croatian state and people.

Where the lovelorn find a home for their sentimental keepsakes.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

A giant portrait of an ancient king looms over the river.

Through the colossal entrance to this cave you'll find limestone tubs and an underground waterfall.

This historical village takes you back to the 19th century.

An idyllic traditional timber village on a picturesque hill was built for a film.

Lines on the pillar of Heidelberg's Karl-Theodor Bridge record the dramatic heights of past floods.

Somber memorial to the May 10, 1933, book-burning which took place on this spot.

Fantastic views and thousands of love locks.

Honoring the star of the “The Bob Newhart Show” which took place in the city of Chicago in the 1970s.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

A pair of gargoyles peer into unsuspecting passengers at Denver’s conspiracy-packed airport.

Commercial aircraft storage facility, where you can see a TWA 747.

These neon green and blue lakes are in the shadow of two huge volcanoes.

The last remaining vestige of a popular 1999 public art display.

Visit the remains of a notorious Victorian-era correctional facility.

A roadway designed for a visiting monarch.

A 18th century graveyard and its astonishing cortege of macabre iconography.

This cliffside memorial marks the final resting place of a lonely violinist.

A largely overlooked statue that may commemorate the first publication of 'Don Quixote' outside of Spain.

This fortified town dating back to the 1400s is often described as an open-air museum and is a protected National Monument of Bosnia and Herzegovina.

When this monument to Slovenia's national poet was erected, it's said to have sparked the ire of nearby church authorities.

This landmark honoring a local beer brand is an iconic part of the Minneapolis skyline.